From be5e0fe012bcf27dca1262057b1b33b7a361a1fc Mon Sep 17 00:00:00 2001
From: =?utf8?q?=EB=B0=95=EC=A2=85=ED=98=84/=EB=8F=99=EC=9E=91=EC=A0=9C?=
 =?utf8?q?=EC=96=B4Lab=28SR=29/Staff=20Engineer/=EC=82=BC=EC=84=B1?=
 =?utf8?q?=EC=A0=84=EC=9E=90?= <jh1302.park@samsung.com>
Date: Mon, 9 Jul 2018 15:38:00 +0900
Subject: [PATCH] [stdex.set] Overload '==' operator (#564)

This commit introduces 'operator==' overloading over sets.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>
---
 contrib/stdex/include/stdex/set | 18 ++++++++++++++++++
 contrib/stdex/src/Set.test.cpp  |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/contrib/stdex/include/stdex/set b/contrib/stdex/include/stdex/set
index 0273935..d6368d1 100644
--- a/contrib/stdex/include/stdex/set
+++ b/contrib/stdex/include/stdex/set
@@ -3,6 +3,24 @@
 
 #include <set>
 
+template <typename T> bool operator==(const std::set<T> &lhs, const std::set<T> &rhs)
+{
+  if (rhs.size() != lhs.size())
+  {
+    return false;
+  }
+
+  for (const auto &element : lhs)
+  {
+    if (rhs.find(element) == rhs.end())
+    {
+      return false;
+    }
+  }
+
+  return true;
+}
+
 template <typename T> std::set<T> operator-(const std::set<T> &lhs, const std::set<T> &rhs)
 {
   std::set<T> res;
diff --git a/contrib/stdex/src/Set.test.cpp b/contrib/stdex/src/Set.test.cpp
index 689a261..3367031 100644
--- a/contrib/stdex/src/Set.test.cpp
+++ b/contrib/stdex/src/Set.test.cpp
@@ -2,6 +2,12 @@
 
 #include <gtest/gtest.h>
 
+TEST(SET, operator_eq)
+{
+  ASSERT_TRUE(std::set<int>({1, 2, 3}) == std::set<int>({1, 2, 3}));
+  ASSERT_FALSE(std::set<int>({1, 3}) == std::set<int>({1, 2, 3}));
+}
+
 TEST(SET, operator_diff)
 {
   const std::set<int> lhs{1, 2, 3};
-- 
2.7.4